You can add a dynamic date parameter to an action river using the ‘Time Period’ option in the top right of the Action River configuration:
Once these values are saved, these will appear in your variables list:
Now, you can use these values in any part of the Action river configuration, such as in the parameters:
Next, create a Data Source to Target river with ‘REST API’ as the source. You should see a date range in the ‘Source’ tab:
If you check the ‘Until Running Day’ box, the river will set the time_range.end_date value to the current date every time the river runs, and the start_date will be set to the end_date of the previous run.
Hope this helps!